Balanced valve for steam-engines.



F. BARNGROVER. BALANCED VALVE r01: STEAM ENGINES.

APPLICATION FILLD [AR-10, 1908.

Patented Dec. 1, 1908.

THE NORRIS Prunes-ca, WASHINGTON, a. C4

FRANK 'BARN GROVER, OF. NEWTON,'IOWA.

BALAN CED VALVE FOR STEAM-ENGINES.

Specificationof Letters Patent.

Patented Dec. 1, 1908.

Application filed. March 10,1908. Serial m. 420,270.

its seat without the undue wear-and tear incident to those valvesin which can excessive pressure acts upon one side thereof.

The invention further contemplates .a valve which willbe evenly balanced at every point in its movement and whichilcan be readily mounted within the steam chest of an ordinary engine.

For a full description of the invention and the merits thereof and also to acquirea knowledge of the details of construction and the means for effecting the result, reference is to be had to the following description and accompanying drawings, in which:

Figure 1 is a longitudinal sectional view through a balanced valve constructed in ac cordance with the invention. Fig. 2 is an end view of the same on a reduced scale.

Fig. 3 is a plan view of the interior of the cover'. Fig. 4 is a bottom plan View of the valve proper.

. tight joint and prevent any leakage of the steam. As illustrated, this valve seat 3 is shown as formed with a central port 5 communicating with the exhaust 6, and the end ports 7 communicating-with the induction ports 2 of the cylinder. It will also be observed that the ports 5 and 7 are laterally elongated and are arrangedparallel to each of. the valve seat. It will beobserved that the ports 5 and 7 of the valve seat-have a lengthslightlygreater than the internal diameter ,of the cover 8, and that the ends of the channels 9 and 10 are flared outwardly as indicatedat 11 and communicate with the corresponding ports of the valve seat.

Shdablyinounted upon the valve: seat 3 1s a valve comprising a stem 12 and the heads '13, the said valve being reciprocated back and forth upon its seat by means of a valve rod 14 actuated in any suitable manner. Each of the heads 13 is formed with a flat face, sliding upon the valve seat 3, and with a curved face corresponding to the interior of the cover 8. The curved face of each of the valve heads or the portion of the valve heads adjacent the cover is grooved to receive a packing band 15. The base of these grooves is formed with a depression 16 which is enlarged at the upper portion of the head to form a-chamber 17 which faces directly away from the valve seat. It will also be observed that the end portions of the depressions 16 adjacent the flat face of the valve heads are offset as indicated at 18 so as to be deflected toward the ends of the valve. It will further be observed that the opposite ends of the valve have the lower edges thereof beveled or cut away at 19 so that in the position of the valve shown in Fig. 1 live steam from the valve chest will enter the induction port 2 at the left of the valve and from the induction port will pass through the depressions 16 into the chamber 17 and act against the inner face of the packing band. It will also be evident that at this position of the valve the steam or other fluid pressure medium will enter the channel 10 at the left of the valve through the flared ends thereof so as to act upon the exterior face of the packing band. The

head 13 atthe left of the valve will thereby be completely balanced so as to reciprocate upon its seat with the minimum amount of friction. The opposite end of the valve will also be balanced since it will be observed that the exhaust steam from the induction port at the right hand end of the valve will be permitted to pass entirely around the valve stem. It will thus be apparent that with the present improved construction of slide valve the fluid pressure medium will act upon all sides of the valve so as to balance the same at all positions thereof and thereby permit the valve to operatewithout undue wear and tear.

Having thus described the invention, what is claimed as new is:

1. In a slide valve, the combination of a valve seat, a valve cover applied to the valve seat and having a channel formed in its interior face, a valve mounted between the cover and valve seat, and a packing band carried by the Valve, the valve being provided under the packing band with a depression and the fluid pressure medium being admitted both to the depression of the valve to act upon the inner face of the packing band and also to the channel of the cover for acting upon the outer face of the packing band.

2. In a slide valve, the combination of a valve seat formed with ports, a cover applied to the valve seat and formed in the interior face thereof with channels which communicate with the ports, a valve mounted between the valve seat and cover and formed with a groove, a depression being provided at the base of the groove and the depression conimunicating with the port of the valve seat, and a packing band arranged in the groove of the valve, the fluid pressure medium being admitted to the depression of the groove to act upon the inner face of the packing band and also to the channels of the cover for acting upon the outer face of the packing band.

3. In a slide valve, the combination of a valve seat formed with ports, a cover applied to the valve seat and provided in its interior with channels communicating with the ports of the valve seat, a valve mounted upon the valve seat and comprising grooved heads, depressions being formed at the base of the grooves, the depressions being adapted to communicate with the ports of the valve seat and being enlarged to form chambers which are disposed opposite to the valve seat, and packing bands arranged in the grooves of the valve, the fluid pressure medium being admitted to the depressions in the groove to act upon the inner face of the packing bands and being also admitted to the channels of the cover to act upon the outer face of the packing bands.

In testimony whereof I aflix my signature in presence of two witnesses.

FRANK BARNGROVER. [n s] IVitnesses A. H. BERGMAN,

H. C. Konr. 

